The sapphire crystal in the centre of the caseback enables the OPXVII hand-wound mechanical movement on a Minerva base to be admired: it is a movement of the highest quality, superbly refinished, with a diameter of 16¾ lignes, 18 jewels, variable inertia balance with swan-neck micrometric regulator, Kif Parechoc® anti-shock device and a power reserve of 55 hours. The movement is visible through the sapphire crystal in the centre of the back.

Both the Radiomir 1940 models are produced in limited editions of 100 units each. Officine Panerai has created 50 sets which consist of the two watches in an exclusive box containing the two models with the same millesime numbering (from 1 to 50).